Here are some books and tools I've found useful while going through the writing, editing, submitting, and publishing phase (And yes, the below are in order of importance...at least the first three are. Then there are the unspoken necessities of a stylish pair of shoes and a good handbag).
I don't think I need to say anything more, do I?
Ask anyone who knows me and they'll know the perfect gift for me is a gift card to an office supply store (Office Max, please). It's like stepping inside a toy store. A red pen is needed to mark up your manuscript. I love to see the white pages molested by red pen marks and highlighter streaks. It makes me feel like I've accomplished something and my novel is slowly becoming a-ma-zing.
A Good Book
Reading good books while you're writing is important on so many levels. 1) You get ideas. There might be a sentence, thought or mention of something that spurs an idea for a novel your way. 2) The more variety of good books you read, the more your style of writing will come through. You'll pick up on all the different styles you've read and create your own. And 3) Reading a good book motivates you to make yours be the best it can be. You want to make sure you elicit all the feelings you had in your readers.
He also has a great ebook about writing queries that I love (How to Write a Great Query Letter). This book isn't about making your first five pages a guaranteed hook, it's a book about getting an agent or a publisher to read past five pages by helping you fix common problems.